nathanw 1eaf7124f7 Fetch the old signal mask for the signal action whether or not we're
setting a new signal action; this makes sigaction(sig, NULL, &oact)
return a sensible value in the signal mask instead of stack trash.

Addresses PR lib/29536.

XXX the mask seen by signal handlers in a program linked with
libpthread but not yet multithreaded will not reflect masks set here.
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